Keep an eye out at Handicraft Market — you're likely to discover some treasure or funny trinket among the stalls here. After you've admired the wares, enjoy a meal from one of the food vendors.
Traveling on a shoestring? Handicraft Market is a good place to start your exploring in Tula de Allende. This community marketplace has free entry. Temple of the Morning Star, Tula Archaeological Site and Tula National Park are close by and also worthy of a visit.